sabotloader is right, the "select" is more consistent. The RS has different granulations but you really need to look, I use RS in my shotgun and it goes off fine.
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Fire at will! Which ones Will? Nyuk, Nyuk, Nyuk
I am not a pyro fan so maybe others will chime in...
Why don't you like it?
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I love Christmas lights. They remind me of the people who voted for Obama. They all hang together; half of them don't work, and the ones that do, aren't that bright.
For those who understand, no explanation is needed. For those who do
not understand, no explanation is possible.
A golf course is a willful and deliberate misuse of a perfectly good rifle range.
As sabot loader said the difference is in screening Select has a minimum and a maximum screen while RS has only a maximum screen.
I ran comparison tests when the only other powder Black I did not find much difference in the three guns I used [all traditional] with #11 caps.
With #11 caps the ignition was more dependable as I had a few rare hang fires with Select. This was with 50 shots with each powder with each gun to me if you don't find a difference in that amount of shooting then there is not one worth looking for.
It is possible that a difference might show up with inlines and 209 ignition but I am not interested enough to do any more testing since I only use it in my Traditionals now. Blackhorn 209 is better suited to inlines in my opinion.